Patent
US 7,824,651METHOD OF PRODUCING EXFOLIATED GRAPHITE, FLEXIBLE GRAPHITE, AND NANO-SCALED GRAPHENE PLATELETS
Aruna Zhamu, Jinjun Shi, Jiusheng Guo, Bor Z. Jang
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 7,824,651Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG.1 A transmission electron micrograph of graphite flakes obtained by ultrasonic wave- 20 effected exfoliation and separation.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A method of exfoliating a layered graphite material to produce separated nano-scaled graphene platelets having a thickness smaller than 100 nm, said method comprising: a) dispersing particles of a n on intecralatcd and non oxidizcd graphite material in a liquid medium containing therein a surfactant or dispersing agent to produce a suspension or slurry, wherein said g ra p hite material has never been subjected to intercalation, chemical oxidation, or exfoliation; and b) exposing said suspension or slurry to ultrasonication at an energy level for a sufficient length of time to produce said separated nano-scaled platelets.
The method of claim 1 wherein said ultrasonication step is conducted at a temperature lower than 1 00*C.
The method of claim 1 wherein said energy level is greater than 80 watts.
The method of claim 1 wherein said ultrasonication step is followed by a mechanical shearing treatment selected from air milling, ball milling, rotating blade shearing, or a combination thereof.
The method of claim 1 wherein said liquid medium comprises water, organic solvent, alcohol, a monomer, an oligomer, or a resin.
The method of claim 1 wherein said platelets have a thickness smaller than 10 mn.
The method of claim 1 wherein said surfactant or dispersing agent is selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, silicone surfactants, fluoro-surfactants, polymeric surfactants, sodium hexametaphosphate, sodium lignosulphonate, poly (sodium 4-styrene sulfonate), sodium dodecylsulfate, sodium sulfate, sodium phosphate, sodium sulfonate, and combinations thereof.
The method of claim 1 wherein said layered graphite material comprises natural graphite, synthetic graphite, highly oriented pyrolytic graphite, graphite fiber, graphitic nano-fiber, or a combination thereof.
The method of claim 1 wherein said liquid medium contains a monomer or a polymer dissolved or dispersed therein to form a nanocomposite precursor suspension.
The method of claim 1 further comprising a step of re-compressing said platelets to obtain flexible graphite sheets.
11.
-22.
Materials described outside the worked examples.
layered graphite material
nano-scaled graphene platelets
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG.1 A transmission electron micrograph of graphite flakes obtained by ultrasonic wave- 20 effected exfoliation and separation.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness | 1.4–13.5 nm | — |
Thickness |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 7,824,651Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG.1 A transmission electron micrograph of graphite flakes obtained by ultrasonic wave- 20 effected exfoliation and separation.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A method of exfoliating a layered graphite material to produce separated nano-scaled graphene platelets having a thickness smaller than 100 nm, said method comprising: a) dispersing particles of a n on intecralatcd and non oxidizcd graphite material in a liquid medium containing therein a surfactant or dispersing agent to produce a suspension or slurry, wherein said g ra p hite material has never been subjected to intercalation, chemical oxidation, or exfoliation; and b) exposing said suspension or slurry to ultrasonication at an energy level for a sufficient length of time to produce said separated nano-scaled platelets.
The method of claim 1 wherein said ultrasonication step is conducted at a temperature lower than 1 00*C.
The method of claim 1 wherein said energy level is greater than 80 watts.
The method of claim 1 wherein said ultrasonication step is followed by a mechanical shearing treatment selected from air milling, ball milling, rotating blade shearing, or a combination thereof.
The method of claim 1 wherein said liquid medium comprises water, organic solvent, alcohol, a monomer, an oligomer, or a resin.
The method of claim 1 wherein said platelets have a thickness smaller than 10 mn.
The method of claim 1 wherein said surfactant or dispersing agent is selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, silicone surfactants, fluoro-surfactants, polymeric surfactants, sodium hexametaphosphate, sodium lignosulphonate, poly (sodium 4-styrene sulfonate), sodium dodecylsulfate, sodium sulfate, sodium phosphate, sodium sulfonate, and combinations thereof.
The method of claim 1 wherein said layered graphite material comprises natural graphite, synthetic graphite, highly oriented pyrolytic graphite, graphite fiber, graphitic nano-fiber, or a combination thereof.
The method of claim 1 wherein said liquid medium contains a monomer or a polymer dissolved or dispersed therein to form a nanocomposite precursor suspension.
The method of claim 1 further comprising a step of re-compressing said platelets to obtain flexible graphite sheets.
11.
-22.
Materials described outside the worked examples.
layered graphite material
nano-scaled graphene platelets
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG.1 A transmission electron micrograph of graphite flakes obtained by ultrasonic wave- 20 effected exfoliation and separation.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness | 1.4–13.5 nm | — |
Thickness |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 7,824,651Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG.1 A transmission electron micrograph of graphite flakes obtained by ultrasonic wave- 20 effected exfoliation and separation.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A method of exfoliating a layered graphite material to produce separated nano-scaled graphene platelets having a thickness smaller than 100 nm, said method comprising: a) dispersing particles of a n on intecralatcd and non oxidizcd graphite material in a liquid medium containing therein a surfactant or dispersing agent to produce a suspension or slurry, wherein said g ra p hite material has never been subjected to intercalation, chemical oxidation, or exfoliation; and b) exposing said suspension or slurry to ultrasonication at an energy level for a sufficient length of time to produce said separated nano-scaled platelets.
The method of claim 1 wherein said ultrasonication step is conducted at a temperature lower than 1 00*C.
The method of claim 1 wherein said energy level is greater than 80 watts.
The method of claim 1 wherein said ultrasonication step is followed by a mechanical shearing treatment selected from air milling, ball milling, rotating blade shearing, or a combination thereof.
The method of claim 1 wherein said liquid medium comprises water, organic solvent, alcohol, a monomer, an oligomer, or a resin.
The method of claim 1 wherein said platelets have a thickness smaller than 10 mn.
The method of claim 1 wherein said surfactant or dispersing agent is selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, silicone surfactants, fluoro-surfactants, polymeric surfactants, sodium hexametaphosphate, sodium lignosulphonate, poly (sodium 4-styrene sulfonate), sodium dodecylsulfate, sodium sulfate, sodium phosphate, sodium sulfonate, and combinations thereof.
The method of claim 1 wherein said layered graphite material comprises natural graphite, synthetic graphite, highly oriented pyrolytic graphite, graphite fiber, graphitic nano-fiber, or a combination thereof.
The method of claim 1 wherein said liquid medium contains a monomer or a polymer dissolved or dispersed therein to form a nanocomposite precursor suspension.
The method of claim 1 further comprising a step of re-compressing said platelets to obtain flexible graphite sheets.
11.
-22.
Materials described outside the worked examples.
layered graphite material
nano-scaled graphene platelets
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG.1 A transmission electron micrograph of graphite flakes obtained by ultrasonic wave- 20 effected exfoliation and separation.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness | 1.4–13.5 nm | — |
Thickness |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 7,824,651Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG.1 A transmission electron micrograph of graphite flakes obtained by ultrasonic wave- 20 effected exfoliation and separation.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A method of exfoliating a layered graphite material to produce separated nano-scaled graphene platelets having a thickness smaller than 100 nm, said method comprising: a) dispersing particles of a n on intecralatcd and non oxidizcd graphite material in a liquid medium containing therein a surfactant or dispersing agent to produce a suspension or slurry, wherein said g ra p hite material has never been subjected to intercalation, chemical oxidation, or exfoliation; and b) exposing said suspension or slurry to ultrasonication at an energy level for a sufficient length of time to produce said separated nano-scaled platelets.
The method of claim 1 wherein said ultrasonication step is conducted at a temperature lower than 1 00*C.
The method of claim 1 wherein said energy level is greater than 80 watts.
The method of claim 1 wherein said ultrasonication step is followed by a mechanical shearing treatment selected from air milling, ball milling, rotating blade shearing, or a combination thereof.
The method of claim 1 wherein said liquid medium comprises water, organic solvent, alcohol, a monomer, an oligomer, or a resin.
The method of claim 1 wherein said platelets have a thickness smaller than 10 mn.
The method of claim 1 wherein said surfactant or dispersing agent is selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, silicone surfactants, fluoro-surfactants, polymeric surfactants, sodium hexametaphosphate, sodium lignosulphonate, poly (sodium 4-styrene sulfonate), sodium dodecylsulfate, sodium sulfate, sodium phosphate, sodium sulfonate, and combinations thereof.
The method of claim 1 wherein said layered graphite material comprises natural graphite, synthetic graphite, highly oriented pyrolytic graphite, graphite fiber, graphitic nano-fiber, or a combination thereof.
The method of claim 1 wherein said liquid medium contains a monomer or a polymer dissolved or dispersed therein to form a nanocomposite precursor suspension.
The method of claim 1 further comprising a step of re-compressing said platelets to obtain flexible graphite sheets.
11.
-22.
Materials described outside the worked examples.
layered graphite material
nano-scaled graphene platelets
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG.1 A transmission electron micrograph of graphite flakes obtained by ultrasonic wave- 20 effected exfoliation and separation.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Thickness | 1.4–13.5 nm | — |
Thickness |
Related documents with shared materials, methods, properties, or citations.
non-intercalated and non-oxidized graphite material
liquid medium
surfactant or dispersing agent
nanocomposite precursor suspension
flexible graphite sheets
| — |
Thickness | ≤ 0.2 mm | — |
Thickness | ≤ 0.01 mm | — |
Thickness | ≤ 1 nm | — |
non-intercalated and non-oxidized graphite material
liquid medium
surfactant or dispersing agent
nanocomposite precursor suspension
flexible graphite sheets
| — |
Thickness | ≤ 0.2 mm | — |
Thickness | ≤ 0.01 mm | — |
Thickness | ≤ 1 nm | — |
non-intercalated and non-oxidized graphite material
liquid medium
surfactant or dispersing agent
nanocomposite precursor suspension
flexible graphite sheets
| — |
Thickness | ≤ 0.2 mm | — |
Thickness | ≤ 0.01 mm | — |
Thickness | ≤ 1 nm | — |
non-intercalated and non-oxidized graphite material
liquid medium
surfactant or dispersing agent
nanocomposite precursor suspension
flexible graphite sheets
| — |
Thickness | ≤ 0.2 mm | — |
Thickness | ≤ 0.01 mm | — |
Thickness | ≤ 1 nm | — |